last.fm is a joke. every one puts in every tag just so it gets more views. clicking through 100 "ambient" tracks gets you metal, pop-rock, pop, country, and everything else. They shouldn't even have genres if they are just going to get abused.

discover new music: e.g. start playing my library and read up links on my profile (e.g. my "music neighbour evolution" page, you can see there which neighbours stay same over time + listen also to their libraries, ...)